[tahoe-dev] Fwd: help needed from a C++ expert for pycryptopp

zooko zooko at zooko.com
Tue Feb 10 14:58:53 UTC 2009


Hooray!  I posted a plea for help on the Crypto++ mailing list, and  
Geoff Beier responded by pointing out that the dlopen flags can be  
dynamically changed, from Python.  See appended message from him.

Before committing this fix, I would like to have builders for  
pycryptopp which are red because of this issue.  I guess that means  
they have libcryptopp.so installed in the system, and the buildmaster  
configures them with --disable-embedded-cryptopp .

Thanks a lot, Geoff Beier!



Begin forwarded message:

> From: Geoff Beier <geoffbeier at gmail.com>
> Date: February 10, 2009 7:27:50 AM MST
> To: zooko <zooko at zooko.com>
> Cc: "Crypto++ Users" <cryptopp-users at googlegroups.com>
> Subject: Re: help needed from a C++ expert for pycryptopp
> Changing test_aes.py to load crypto++ differently does the job on  
> my ubuntu amd64 machine. You can probably find a suitable place in  
> the python portion of your library to do this; I'm no python expert ;)
> Change:
> from pycryptopp.cipher import aes
> to:
> import sys, ctypes
> flags = sys.getdlopenflags()
> sys.setdlopenflags(flags|ctypes.RTLD_GLOBAL)
> from pycryptopp.cipher import aes
> sys.setdlopenflags(flags)
> and all the tests pass.
> HTH,
> Geoff

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